Ever since Andersen Consuling split from Arthur Andersen, rumors have circulated about how the consulting firm would proceed with financing for the long term.Late last week, the 2,500 partners met in Miami, and agreed to study the possibility of an IPO, or Initial Public Offering, of stock that, if sold, could value the firm at more than $20 billion.The vast consolidation taking place within the accounting profession is good news for Andersen Consulting, who compete against other consulting arms that have, or wil